bitflags! {
    #[derive(PartialEq, Eq, PartialOrd, Ord)]
    pub struct U32: u32 {
        const A = 0b00000001;
        const B = 0b00000010;
        const C = 0b00000100;
    }
}

#[test]
fn test_flags() {
    match U32::A | U32::B {
        U32::A | U32::B => {},
        _ => panic!()
    }
}